235 results about "Intergranular corrosion" patented technology

The invention provides a deep learning-based bridge structure erosion degree monitoring method, which comprises the following steps of: for bridge steel samples of different types and parts, characterizing grain boundary structures and grain orientation microstructure characteristics by utilizing an electron back scattering diffraction method, and determining typical microstructure types of crystals; performing preprocessing and feature engineering processing on the obtained large sample data set, extracting chloride ion concentration and microstructure features, and constructing training data of an intercrystalline corrosion prediction model; according to the change rule of the chloride ion concentration and the typical microstructure type of the crystal, a bridge steel intergranular corrosion prediction model is constructed, and training and verification are carried out on a large sample data set; a wireless sensor network is arranged in a bridge steel service environment, chloride ion concentration and temperature and humidity environment parameters are collected in real time, and data needed by model input are obtained through data preprocessing and feature extraction.

The invention discloses a rolled extra-thick stainless steel composite plate and a production method thereof. Base layer steel comprises the following chemical components in percentage by weight: 0.12-0.16% of C, 0.18-0.30% of Si, 1.30-1.50% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.02-0.04% of Alt, 0.15-0.25% of Cr, 0.50-0.60% of Mo, 0.55-0.65% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.02% of Nb, less than or equal to 0.0010% of B and the balance of Fe and inevitable impurity elements. The cladding stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, less than or equal to 0.75% of Si, less than or equal to 2.00% of Mn, less than or equal to 0.035% of P, less than or equal to 0.015% of S, 8.0-12.0% of Ni, 18.0-20.0% of Cr, less than or equal to 0.10% of N and the balance of Fe and inevitable impurity elements; the process route comprises the steps of blank welding compounding, vacuumizing, controlled rolling and quenched-tempered heat treatment. The SA533B CL1 + SA240304L stainless steel composite plate with the thickness of 62-69 mm is produced, the inspection yield strength is larger than 345 MPa, the tensile strength is larger than 550 MPa, the impact energy at the temperature of 10 DEG C is larger than or equal to 200 J, the shear strength is larger than 310 MPa, and the intergranular corrosion crack rate is 0.

The invention discloses a corrosion-resistant aluminum alloy profile and a preparation method thereof, and belongs to the technical field of aluminum alloy profiles. By optimizing the components of the corrosion-resistant aluminum alloy, the strength of the aluminum alloy profile can be guaranteed, and the corrosion resistance of the aluminum alloy profile is positively influenced. Besides, the corrosion-resistant coating is formed on the surface of the corrosion-resistant aluminum alloy base material in a laser cladding mode, the corrosion resistance of the aluminum alloy profile can be remarkably improved while the application performance of the aluminum alloy profile is guaranteed, and in the corrosion-resistant coating, nickel powder can enhance pitting corrosion resistance and intergranular corrosion resistance, so that the corrosion resistance of the aluminum alloy profile is improved. The adhesive force with an aluminum alloy base material is improved; the boron nitride can improve the acid resistance and wear resistance of the surface of the aluminum alloy profile and block a corrosion channel; the lanthanum oxide and the cerium dioxide have a synergistic effect, so that surface grains can be refined, air holes generated in the cladding process are reduced, the compactness of the coating is improved, the compatibility with an aluminum alloy base material is promoted, and the apparent quality of the aluminum alloy profile is guaranteed.

The invention discloses a preparation method of a stainless steel layered composite plate, which comprises the following steps: (1) grinding the surfaces of a stainless steel plate and a carbon steel plate which need to be compounded, then forming air exhaust holes in the edges of the opposite positions of the same ends of the stainless steel plate and the carbon steel plate, and laminating the stainless steel plate and the carbon steel plate to form an initial layered plate; (2) sealing and welding the periphery of the initial laminated plate; (3) the initial layered plate is subjected to air exhaust treatment through the air exhaust holes, and a layered composite plate blank is obtained; and (4) carrying out hot isostatic pressing treatment on the layered composite plate blank, after the hot isostatic pressing treatment is finished, carrying out pressure relief, cooling, discharging and air cooling to room temperature, then carrying out heating and hot rolling treatment, and finally straightening. By means of the method, the stainless steel layered composite plate with the large-range thickness can be prepared, the plate shape is good, stainless steel and carbon steel form compact and inclusion-free metallurgical bonding, the bonding strength reaches 360 MPa or above, the tensile strength and impact toughness of the composite plate are good, and the stainless steel intergranular corrosion performance is qualified.

The invention discloses a production method of a T2+Q355B copper steel rolled composite plate. The technological process comprises the steps of assembling, heating, rolling, stack cooling, finishing, flaw detection and warehousing. A T2 + Q355B copper steel rolled composite plate with excellent bonding strength, mechanical property and conductivity is obtained by adopting a vacuum rolling composite technology, a symmetric assembly technology and a low-speed deformation technology and utilizing wide and thick plate production line equipment and technical advantages, the thickness of a base material ranges from 5 mm to 40 mm, the thickness of a composite layer ranges from 1 mm to 20 mm, the width is smaller than or equal to 3600 mm, the yield strength is larger than or equal to 250 Mpa, the tensile strength ranges from 350 Mpa to 600 Mpa, the shear strength is larger than or equal to 120 Mpa, and the composite layer T2 copper conductivity IACS is larger than or equal to 85%. The intergranular corrosion crack rate is 0. The product can be widely applied to the fields of high-voltage electric appliances, ship manufacturing, new energy equipment and the like, and has the potential of replacing traditional products.

The invention relates to corrosion-resistant austenitic stainless steel for spent fuel aftertreatment and a preparation method of the corrosion-resistant austenitic stainless steel, belongs to the field of nuclear materials and technologies, and solves the key problem that existing domestic commercial austenitic stainless steel is prone to intergranular corrosion in a nitric acid medium in a special spent fuel aftertreatment environment. The stainless steel comprises the following components in percentage by weight: 15.0 to 20.0 percent of Cr, 12.0 to 18.0 percent of Ni, 3.0 to 6.0 percent of Si, 0.05 to 2.0 percent of Mn, 0.05 to 2.0 percent of W and Mo, 0.20 to 0.20 percent of N, 0.20 to 0.20 percent of Nb and V, 0.05 to 0.05 percent of rare earth element RE and the balance of Fe and inevitable impurity elements: less than or equal to 0.010 percent of C, less than or equal to 0.005 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.005 percent of O and less than or equal to 0.005 percent of B. The preparation method of the stainless steel comprises the steps of vacuum induction melting, vacuum consumable remelting, thermal machining and solution treatment.

The invention relates to the technical field of pressure vessel health monitoring and nondestructive testing, in particular to an electromagnetic acoustic surface wave-based pressure vessel intergranular corrosion non-contact detection system, which comprises the following modules: a multi-field coupling electromagnetic acoustic surface wave detection module, which comprises a plurality of detection unit arrays, each detection unit comprises a magnetic biasing module and an impedance matching module and is used for generating a local magnetic field on the surface of the pressure vessel and optimizing signal excitation and receiving; and the signal acquisition and preprocessing module is used for acquiring the surface wave signal of the detection module and carrying out denoising, filtering, curved surface coupling difference correction and lift-off correction on the signal to obtain high-quality signal data. According to the method, non-contact quantitative detection of the intergranular corrosion of the pressure vessel is realized through multi-field coupling electromagnetic acoustic surface wave detection and microscopic and macroscopic mapping and inversion, so that the problem that early corrosion is difficult to quantify due to the fact that contact ultrasound is mostly adopted in traditional pressure vessel detection and grain boundary micro-damage cannot be effectively identified is solved.

The invention relates to the field of welding materials of austenitic stainless steel, in particular to a flux-cored wire based on concentrated nitric acid corrosion-resistant austenitic stainless steel and a preparation method, and aims to solve the problems that an existing welding material of the austenitic stainless steel is poor in concentrated nitric acid corrosion resistance, intergranular corrosion and stress corrosion cracking are prone to occurring in a concentrated nitric acid environment, and the welding quality is poor. Therefore, the service life and the safety of the equipment are influenced. According to the austenitic stainless steel flux-cored wire, by optimizing the chemical components and the preparation process, the corrosion resistance and the welding performance of the welding wire in a concentrated nitric acid environment are remarkably improved, the use requirements in a high-corrosion environment can be met, and a welded joint has high strength and toughness; the performance requirement of an engineering structure on a welding joint can be met; the austenitic stainless steel flux-cored wire is suitable for welding equipment, pipelines and structures in contact with concentrated nitric acid in the industries of chemical engineering, petrochemical engineering, pharmacy and the like, and has wide application prospects.

The invention relates to the technical field of petrochemical equipment, and discloses a Ni-Cr-Mo corrosion-resistant alloy seamless tube for petrochemical equipment and a manufacturing method, the seamless tube comprises the following components: C < = 0.01%, Si < = 0.05%, Mn < = 0.30%, P < = 0.015%, S < = 0.005%, 22.2-24.0% of Cr, 16.0-17.0% of Mo, T < = 0.10%, A < l > < = 0.30%, 1.3-1.9% of Cu, Co < = 0.50%, Fe < = 1.5%, Nb < = 0.10%, W < = 0.40%, N < = 58.0%, and the sum of the components is 100%. By accurately controlling the proportion of alloy components and strictly limiting the contents of elements such as carbon, silicon, phosphorus and sulfur, key elements such as chromium, molybdenum and nickel are reasonably blended. Wherein the carbon content is strictly controlled not to exceed 0.01%, so that the precipitation of carbides is effectively avoided, and the intergranular corrosion resistance is improved; and the chromium content is controlled to be 22.2-24.0%, so that the oxidation resistance and the corrosion resistance are enhanced. All the elements have a synergistic effect, so that the alloy seamless tube has high strength, good toughness and excellent corrosion resistance, and can stably work in a high-temperature and high-pressure petrochemical environment accompanied by a strong corrosive medium.

The invention relates to the technical field of stainless steel composite plates, in particular to a stainless steel composite plate for a thick bridge and a preparation method of the stainless steel composite plate for the thick bridge, and the method comprises the following steps: carrying out single assembly treatment to obtain a composite blank, carrying out primary heating and rolling on the composite blank, carrying out secondary heating, controlled rolling and controlled cooling treatment to obtain the composite plate, tempering and straightening; wherein the single-time assembly treatment specifically comprises the steps that beveling and drilling are conducted on the four edges of the to-be-compounded side of the base material to form air exhaust holes, the to-be-compounded face of the clad stainless steel is attached to the base material, then welding sealing is conducted, and vacuumizing treatment is conducted. The problems that the stainless steel composite plate for the high-performance thick-specification bridge is difficult to produce through symmetric assembly rolling and rolling is difficult to achieve through a conventional single assembly are solved, the produced stainless steel composite plate for the bridge is excellent in interface bonding, the shear strength is larger than or equal to 380 MPa, the yield ratio is smaller than or equal to 0.83, the impact Akv of a base material at the temperature of-40 DEG C is larger than or equal to 250 J, and the intergranular corrosion resistance of a covering material is excellent; and the steel plate has good comprehensive performance and plate shape.

The invention discloses a neutral organic chelating cleaning agent for a boiler, and belongs to the field of chemical cleaning of boiler superheaters of thermal power plants. The cleaning agent is prepared from the following components in percentage by weight: 0.5%-5% of ethylenediamine tetraacetic acid ammonium, 0.1%-4% of acetic acid or ammonium acetate, 0.1%-3% of glycollic acid ammonium or glycollic acid, 0.1%-5% of a pH regulator, 0.1%-1% of a cosolvent, 0.2%-0.8% of a corrosion inhibitor SH369, 0.1%-0.6% of a reducing agent, 0.0%-0.3% of a defoaming agent, 0.0%-0.2% of a surfactant and 84%-93% of water, wherein the pH value of the cleaning agent is 6-8; the cosolvent is tartaric acid and / or hydroxybutyl diacid, the surfactant is nonylphenol polyoxyethylene ether, and the reducing agent is hydrazine. The cleaning agent disclosed by the invention has good dissolving capacity on oxide skin, does not generate precipitates to cause pipe blockage, is a neutral solution, is very small in corrosivity, does not generate intergranular corrosion, is beneficial to protecting various pipes of superheaters and reheaters, and is a safe and efficient superheater cleaning agent.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

The invention belongs to the field of stainless steel pickling, and particularly relates to an austenitic stainless steel whole-hydrochloric-acid-based stepped pickling method. At present, stainless steel pickling is mainly based on a mixed acid pickling (nitric acid and hydrofluoric acid) system, the problem of three-waste discharge exists in the pickling process, the pickling process is only suitable for removing ferritic stainless steel with weak binding force between an oxide layer and a metal matrix through pickling, and the oxide layers on the surfaces of ferritic cold plate stainless steel and austenitic stainless steel are difficult to remove. In order to solve the problems, hydrochloric acid is used for providing an acid environment, a pre-pickling and grading final pickling cooperative treatment method is adopted, a compact oxide layer on the surface of the austenitic stainless steel can be effectively removed, surface polishing and surface passivation can be achieved through the anodic polarization effect, and the stainless steel surface after pickling is free of pitting corrosion and intergranular corrosion phenomena; and the pickled stainless steel surface has high smoothness, the leveling and polishing quality of the BA plate can be remarkably improved, meanwhile, the production cost is low, and pickling waste liquid can be regenerated and recycled.

This disclosure provides an aging process or a method for aging aluminum alloys. For example, the aging process can be performed on 6xxx Al—Si—Mg—Cu aluminum alloys to result in production of such alloys with improved intergranular corrosion (IGC) resistance. The disclosed aging process includes subjecting a solution heat treated and quenched 6xxx aluminum alloy to a temperature above an aging hardening temperature of said alloy but below the solution heat treatment temperature for a short period of time, and then subjecting said alloy to an aging heat treatment at an aging hardening temperature.

The invention discloses a method for improving the corrosion resistance of a 5xxx aluminum alloy plate strip, which belongs to the field of metal forming and comprises the following steps: soaking 5xxx aluminum alloy in a heat preservation container filled with liquid nitrogen and fully cooling; and the fully cooled 5xxx aluminum alloy plate is fed into a rolling mill to be rolled, and the 5xxx aluminum alloy plate and a roller are fully cooled before each pass of rolling. The brittleness characteristic of the coarse second phase in the low-temperature environment is utilized, so that the coarse second phase in the 5xxx aluminum alloy plate is broken in the deep cooling rolling process. In the subzero treatment process, due to the difference of the volume shrinkage effect between the second phase and the base body, the interface bonding strength of the aluminum base body and the second phase is effectively improved, and therefore better pitting corrosion resistance is achieved. Compared with room-temperature rolling, deep cooling rolling improves the proportion of small-angle grain boundaries in the 5xxx aluminum alloy, so that separation of a beta phase is inhibited, and the intergranular corrosion performance is improved. The more corrosion-resistant 5xxx aluminum alloy has great development significance in industries such as ships, rail transit, spaceflight and military affairs.

The invention discloses a method for improving intergranular corrosion resistance of a 6013 aluminum alloy. The method comprises the following steps that the 6013 aluminum alloy is sequentially subjected to solution treatment, quenching, pre-aging treatment and secondary aging treatment. According to the method, the strength of the 6013 aluminum alloy is not affected while the intergranular corrosion resistance of the 6013 aluminum alloy is improved, the industrial production requirement is completely met, and the method is suitable for large-scale industrial application.

The application discloses an intermediate processing liquid for an electroless nickel immersion gold (ENIG) production line and a chemical gold preparation method. The intermediate processing liquid is applied between the electroless nickel plating and immersion gold processes, and comprises (a) a pH buffer and a metal ion complexing agent: a total concentration of 50-150 g / L; (b) an adsorptive corrosion inhibitor: a concentration of 0.5-5.0 g / L; (c) a low-foam non-ionic surfactant: a concentration of 0.01-10 g / L; (d) an auxiliary antioxidant: a concentration of 0.5-30 g / L; (e) a dissolving agent: a concentration of 1-50 ml / L; (f) a pH regulator: an appropriate amount, which is added to maintain the pH value of the intermediate processing liquid at 4.0-6.5; and (g) deionized water: a balance, so that the concentrations of the above components reach the set target values; and the intermediate processing liquid has a design use temperature of 20-45 DEG C. The intermediate processing liquid removes residual nickel ions on the board surface and in micropores through strong complex cleaning, and blocks the pollution to the subsequent gold tank; meanwhile, the preferential adsorption of the corrosion inhibitor molecules at the nickel layer grain boundaries forms a controllable molecular-level protective film, effectively adjusts the immersion gold replacement reaction kinetics, and prevents the occurrence of intergranular corrosion (black plate).

The invention relates to a method and a product for regenerating and repairing duplex stainless steel, the duplex stainless steel is used for a nuclear-grade main pipeline, pulse current with optimized parameters is adopted to treat the duplex stainless steel in the nuclear-grade main pipeline with pitting corrosion or intergranular corrosion generated in the service process, the corrosion resistance of the duplex stainless steel is recovered, and dynamic self-repairing of a passive film is achieved. According to the method, pulse current in-situ / near-in-situ treatment is carried out on the duplex stainless steel for the nuclear-grade main pipeline under the electric-thermal coupling condition, components do not need to be disassembled or large-volume furnace heating does not need to be carried out, and the structure and geometric accuracy of a casting are not changed; by selecting matched parameters such as pulse frequency, pulse width, current density and treatment time, an amplitude-modulated decomposed structure in a ferrite phase and a phase interface precipitated phase are promoted to be re-dissolved, the formation dynamics and stability of a passive film are improved, and the corrosion resistance and toughness of an aged material are recovered or close to an unaged state.

The invention relates to the technical field of laser welding, in particular to a water curtain cooling stainless steel pipe intelligent laser welding device which comprises a machine body, and a welding mechanism is arranged on the machine body and used for stainless steel pipe welding machining. The water curtain assembly comprises a lower ring frame fixed to the outer wall of the lower end of the laser welding device, L-shaped supports are pivoted to the outer walls of the left end and the right end of the lower ring frame, round sleeves are fixed to the outer ends of the L-shaped supports, nozzles are installed in the round sleeves in a penetrating mode, an upper ring frame is fixed to the outer wall of the upper end of the laser welding device, and first air cylinders are pivoted to the outer walls of the left end and the right end of the upper ring frame. The lower output end of the first cylinder is pivoted with the upper end of the L-shaped bracket; the welding seam is precisely covered and rapidly cooled through the dynamically adjusted flat water curtain, the intergranular corrosion tendency is remarkably restrained, welding deformation is reduced, meanwhile, air is isolated to improve surface oxidation, and the corrosion resistance, the size precision and the appearance quality of a connector are comprehensively improved.

The invention provides a constant-temperature corrosion control device and a constant-temperature corrosion control method for aluminum alloy intergranular corrosion. The constant-temperature corrosion control device comprises a test box unit and a corrosion unit, the test box unit comprises a test box and a test box bracket; the corrosion unit comprises a vessel, a sample, a clamp, a string / belt and a vessel cover; an intergranular corrosion solution is contained in the vessel, the vessel is arranged in the test box, a sample is clamped on the surface of the sample through a clamp, the clamp penetrates through the vessel cover through a thin rope / belt and is connected to a test box support, and the test box support is located at the top end of the test box and can meet parallel tests of three or more sample products. Under the condition that the sample is not damaged, the temperature of the intergranular corrosion solution is controlled according to the heat conduction and heat convection principle of the test box, and the accurate control problem of the corrosion temperature in the aluminum alloy intergranular corrosion method is solved.

The invention discloses a method for improving intergranular corrosion resistance of a near surface of a GH4169 alloy. The method comprises: designing a moving path and a moving rate of a manipulator on a sample surface; clamping a plasma generator by using a manipulator, and carrying out near-surface rapid solid solution-aging integration treatment on the surface of the sample; and cooling the surface of the sample, and the like. The method has the advantages that the technological process is simple, the efficiency is high, the whole treatment process only needs three steps, extra pretreatment and post-treatment are not needed, consumption of other functional materials or material reduction processing is not needed, and the cost is low. The near-surface intergranular corrosion resistance of the GH4169 alloy can be obviously improved through a near-surface rapid solid solution-aging integrated treatment technology of a high-energy plasma beam. And near-surface rapid solid solution and aging treatment with the depth of about 40 microns from the surface of the alloy can be carried out, near-surface intergranular corrosion resistance of the GH4169 alloy is achieved, the requirement for improving the environmental corrosion resistance of the alloy is met, the internal microstructure of the alloy is not changed, and it is guaranteed that the internal comprehensive mechanical property of the alloy is not reduced.

The invention discloses a corrosion-resistant rolled composite steel plate for medium-temperature equipment and a manufacturing method of the corrosion-resistant rolled composite steel plate. The composite steel plate comprises a base material, a composite layer and a transition layer between the base material and the composite layer, the base material is prepared from, by weight, 0.01%-0.15% of C, 0.2%-0.7% of Si, 0.1%-1.70% of Mn, 0.006%-0.025% of Ti, 0.004%-0.015% of Als, 0.0010%-0.050% of Nb, 0.15%-0.50% of V, 0.0005%-0.0050% of B, 0.0015%-0.0050% of N, smaller than or equal to 0.0165% of P, smaller than or equal to 0.010% of S, smaller than or equal to 0.005% of O and the balance Fe and other inevitable impurities. By blocking or reducing diffusion of carbon elements on the base material carbon steel side at the interface of the composite steel plate, the possibility of failure caused by intergranular corrosion of stainless steel on the composite layer side is reduced, the corrosion resistance and safety performance of the rolled composite steel plate are comprehensively improved, and the composite steel plate is suitable for 300-450 DEG C medium-temperature equipment in the field of energy manufacturing of petroleum refining, coal chemical industry and the like.

The invention relates to the technical field of pressure vessel intergranular corrosion detection, in particular to a nonlinear ultrasonic guided wave detection method for pressure vessel intergranular corrosion. The system comprises a signal generation and emission module, a signal acquisition and preprocessing module, a feature extraction and analysis module, a damage positioning and evaluation module, an optimization and calibration module and a data storage and visualization module. According to the invention, through cooperative work of the multi-band excitation signal and the distributed sensor array, the detection sensitivity and resolution are significantly improved; a nonlinear characteristic matrix and a multi-level decomposition capture material nonlinear effect are utilized to realize accurate positioning and evaluation; an adaptive parameter adjustment mechanism simplifies the operation process and reduces the detection cost; and a cloud database and a graphical interface are convenient for result storage and analysis. The intergranular corrosion can be efficiently and reliably detected, and a scientific basis is provided for the industrial field.

The utility model discloses a kind of grinding devices of electrostatic contact, belong to grinding processing equipment technical field, the grinding device includes the clamping assembly for clamping electrostatic contact, first station is equipped on clamping assembly, hot shrink tube is placed on first station, hot shrink tube is inserted for the clamping part of electrostatic contact, air gun assembly is equipped on clamping assembly, air gun assembly can spray high-temperature hot gas, when clamping assembly moves to the clamping part of electrostatic contact, air gun assembly is spirally rotated with hot shrink tube as center, so that hot shrink tube is heat-shrunk and tightened and the clamping part of electrostatic contact is connected, to when clamping assembly clamps the clamping part of electrostatic contact, clamping assembly is clamped on heat-shrunk and tightened hot shrink tube.The utility model makes grinding fluid permeability zero by heat shrink tube sealing, radically cure intergranular corrosion, simultaneously, realize micro-newton level flexible clamping by heat shrink tube buffer, avoid clamping damage, and pass through the heating mode of spiral heating and end portion reinforcement to guarantee sealing property.

The invention discloses a steel plate, a hot stamping part and a preparation method and application thereof, and belongs to the technical field of alloy materials, the hot stamping part comprises an oxide layer, an alloy layer and a steel matrix, and the alloy layer is located between the oxide layer and the steel matrix; in the alloy layer, the phase proportion of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 80%, and the occurrence frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 1%. In addition, the invention further discloses a steel plate component and a preparation method of the hot stamping part and a hot forming process of the hot stamping part. According to the method, the LME resistance of the Fe content in the alloy layer is improved, meanwhile, the crystal configuration of the plating layer is regulated and controlled, the frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% in the zinc-iron alloy layer is improved, and the corrosion resistance of a hot forming part is considered while the LME resistance is achieved by means of the good intergranular corrosion resistance of the coincidence lattice structure.

The invention discloses a duplex stainless steel base metal layered surfacing welding process, which adopts a surfacing welding machine to build up a nickel-based alloy welding material on a duplex stainless steel base metal in a gas shielded welding state, and specifically comprises the following steps: controlling the temperature of the base metal before welding, controlling the preheating temperature between 10 DEG C and 20 DEG C, and adopting a multi-layer welding mode according to the structure and use requirements of the base metal, the method comprises the following steps: firstly, carrying out surfacing on a first layer, then sequentially carrying out surfacing on a next layer, and when the interlayer temperature reaches 145-150 DEG C and the interlayer temperature is reduced to 28-32 DEG C by using a cooling device, carrying out surfacing again, adopting an S31803 material as a duplex stainless steel base material, and adopting an ERNiCrMo-3 argon arc welding wire as a nickel-based alloy welding material. By means of the method, welding of the nickel-based alloy and the duplex stainless steel can be achieved, on the basis that the corrosion resistance of the duplex stainless steel is guaranteed, the material abrasion resistance is improved, the percent of pass of a surfacing layer is increased, the problems of hot cracks, air holes, intergranular corrosion of a welding joint and the like in the welding process of the nickel-based alloy and the high-strength steel are solved, and the welding quality and the use performance are guaranteed.

The invention discloses non-magnetic drill collar steel capable of improving stress corrosion resistance and a preparation method of the non-magnetic drill collar steel. The preparation method of the non-magnetic drill collar steel for improving the stress corrosion resistance comprises the steps of electric furnace smelting, AOD smelting, LF refining, continuous casting, electroslag, cogging, solution treatment and low-temperature forging. The non-magnetic drill collar steel for improving stress corrosion resistance comprises the following chemical components in percentage by mass: 0.02%-0.06% of C, less than or equal to 0.45% of Si, 20.0%-22.5% of Mn, less than or equal to 0.03% of P, less than or equal to 0.01% of S, 17.0%-20.0% of Cr, 0.90%-3.50% of Ni, 0.6%-2.0% of Mo, 0.6%-0.8% of N, less than or equal to 0.01% of B, more than or equal to 31% of PREN (Cr + 3.3 Mo + 16N), and the balance of Fe and inevitable impurities. According to the method, a high-alkalinity slag system and Al are adopted for deep deoxidation, a 40F pre-melting slag system is adopted for electroslag, argon filling protection is conducted, so that the steel billet is low in oxygen and high in purity, the round steel with the uniform grain size is forged through fast forging cogging high-temperature solid solution and low-temperature forging strengthening, the conventional mechanical performance, the non-magnetic performance, the intergranular corrosion resistance and the like are improved, and meanwhile the long stress corrosion service life is achieved.

The invention relates to high-strength and high-corrosion-resistance ultra-pure austenitic stainless steel and a manufacturing method thereof, and belongs to the technical field of stainless steel manufacturing. The austenitic stainless steel comprises less than or equal to 0.008% of C, less than or equal to 0.10% of Si, less than or equal to 0.50% of Mn, less than or equal to 0.005% of P, less than or equal to 0.005% of S, 24.00%-26.00% of Cr, 20.00%-22.00% of Ni, less than or equal to 0.10% of Mo, less than or equal to 0.02% of Al and Blt. 0.003%, Zr < = 0.6%, Mg < = 0.05%, and the balance Fe. Under the combined action of the optimized element ratio and the low-temperature large-deformation forging method, the strength and corrosion resistance of the ultra-pure austenitic stainless steel can be improved at the same time, the tensile strength of the ultra-pure austenitic stainless steel is 520 MPa or above, the yield strength of the ultra-pure austenitic stainless steel is 230 MPa or above, and the phenomenon of intergranular corrosion is not found after corrosion is conducted in a corrosion test.

The invention is suitable for the technical field of metal material processing, and provides a preparation method and application of an aluminum alloy welding wire, and the method comprises the following steps: step 1, preparing an aluminum magnesium alloy melt, adding a nucleating agent with a twin crystal structure, and casting into an aluminum magnesium alloy cast ingot; and 2, the prepared cast ingot is subjected to hot extrusion, a wire blank is prepared, and the aluminum alloy welding wire is prepared by adopting multi-pass drawing and gradual fine drawing. The method specially aims at grain boundary regulation and control of the welding joint, and a new thought is provided for preparing the high-strength corrosion-resistant aluminum alloy welding wire. The aluminum alloy welding wire using the method is used for fusion welding of aluminum alloy, and the grain structure of a welded joint contains high-density twin boundaries. Compared with a conventional welding joint, the joint containing the high-density twin boundaries not only has higher hardness, but also can keep good intergranular corrosion resistance in the long-term service process.